His experiences as a naval officer assigned to the Combat Intelligence Unit, Pearl Harbor, during World War II. Assignment to Station HYPO, February, 1942; comments about Joseph Rochefort, Jasper Holmes, Edwin Layton, and Chester Nimitz; comments about the breaking of JN- 25; role of intelligence in the Battles of the Coral Sea and Midway; role of intelligence in the shooting down of Admiral Isoroku Yamamoto's plane; role of intelligence in U. S.

His experiences as a cryptanalyst during World War II. U.S. Naval Academy, 1930-34.